Spark-arrester.



A. HALL.

SPARK ARRESTER.

PPLIOATIQN FILED od'r. 23,1907.

Patented o@t.2o,19o8.

Inventur @wat ALFRED HALL, OF EDMONTON, ALBERTA, CANADA.

SPARK-ARRESTER.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application led October 23, 1907. Serial N o. 398,822.

To kall whom 'it may concern:

Be it known that I, ALFRED HALL, of the city of Edmonton, in the Province of Alberta, Canada, machinist, have invented certain new and useful Improvements in Spark- Arresters, of which the following is the specification.

My invention relates to spark arresters, and the object of the invention is to provide means which will arrest sparks passing up through a smoke stack, and detain them in their upward flight sufficiently long enough for them to become dead and harmless, without using a netting of any kind,

and without in any way affecting the draft from the stack.

It consists essentially in an inverted cone placed in the stack, such cone having tubes passing through it, with the outer protruding end of the tube one-half cut away, and an adjustable inner cone carried by the support for the outer cone, and against which the tubes are adapted to direct the sparks, the parts being arranged and constructed as hereinafter more particularly described.

Figure 1 is a vertical section through a smoke stack to which my invention has been applied, the cones being shown in side elevation. Fig. 2 is a vertical sectional view through the center of the smoke stack andI the cones. Fig. 3 is an enlarged detailed vertical sectional view through the lower portion of the cones within the stack, showing the manner in which the inner cone is supported from the outer cone, such section being taken to pass centrally through the tubes. Fig. 4 is, an enlarged detailed sectional view of one of the tubes, showing the manner in which they are cut away.

In the ldrawings like characters of reference indicate corresponding parts in each figure.

1 is the base of the stack, and 2 the body, the base carrying a flange 3, by which the smoke stack may be bolted to the smoke box. The upper portion of the stack is preferably enlarged at 4, and carries a flange 5, to which is bolted the upper section 6 of the stack, such section decreasing gradually in cross sectional area until it reaches practically the 'same area as that of the body.

7 is an inverted hollow cone supported within the enlarged portion of the stack by a central threaded shaft S which is secured within the apex of the cone and passes upwardly to a cross bar or spider 9, which has a threaded opening centrally therein to receive it. The cross bar is fastened within thenpper portion of the stack in any convenient manner.

10 and 11 are nuts screwing on the shaft S, one above and one below the plate 9, and consequently according to the position of the nuts, so the position of the cone 7 is determined in the stack. The normal position of the conical cone within the stack is such that the upper edge 12 passes above the largest cross sectional area of the stack, as is shown in the drawings.

13 are tubes or pipes having their one end 14 half cut away, the main cut at 15 running longitudinally of the pipe. The whole pipe tapers slightly from the end 14 to the. end 16. The cone has openings 17 to receive the tubes, the tubes being simply forced into the openings and held therein, on account of the taper of the pipe, as above shown, it be-V ing understood of course that the bore in the cone be also tapered to accommodate the tube. The position of the tubes in the cone is such that the end 14 has the open side face downward and somewhat inclined, in order that the sparks when striking that part of the tube may readily tend to pass upwardly within the tube. In the drawings the tubes are shown at right angles to the face of the cone. The tubes are arranged in series over the face of the cone, it being especially desirable that they be placed so that a spark cannot pass completely across the faceof the cone without being arrested by one of the overhanging tubes.

In referring to the drawing it will be seen that the annular horizontal area between the cone and the enlargement 4, of the smoke stack, gradually decreases, the reason for this being that as you pass upwardly on the cone the number of the tubes increase, and consequently the combined area of the tube openings is larger. It is desirable to have the draft area constant throughout, or in other words the horizontal annular area in any given plane, plus the combined cross sectional area of the openings in the tubes in the plane should be the same. This accounts for the decrease in the annular horizontal area, passing upwardly.

18 is a second inverted cone passing within the cone 7 and the tip or lower end 19 of the cone is bored and threaded internally to receive the threaded shaft 8.

20 is a nut on the shaft adapted to screw down against the cone and lock it in any desired position. The bur'ning sparks in passing up the stack are drawn through the tubes and their direction is changed, this tending to initially arrest and deaden them. After passing through the tubes they strike against the outer face of the inner cone, and this again changes their direction, deadening and arresting them. From the face of the inner cone they pass to the over-hanging side of the upper section 6 of the stack, where they are finally deflected, and pass out through the top of the stack.

I have found that when the sparks finally leave the stack they are quite pulverized and dead, and that there is no tendency for them to set fire to anything when they have passed to the ground.

It will be noticed that the inner cone is adjustable by simply loosening the nut 20, and screwing the cone up or down on the shaft 18. Then the cone has been placed in the best position for operation in any prac-' tical case, the nut 2O is screwed down tight, and in this way locked in position.

That I claim as my invention is:

1. A spark arrester comprising an inverted hollow cone having openings therethrough and semi-circular projections on the outer face of the cone, each projection surrounding the upper half of each opening.

2. A spark arrester comprising an inverted hollow cone having openings therethrough, tubes passing through the openings and extending outwardly beyond the cone, said tubes having their lower half cut away.

3. A smoke stack having an upper enlargement therein, and an inverted hollow cone supported within the enlargement, said cone having openings therethrough, and semi-circular projections on the outer face of the cone and at the upper side of each opening.

4. In a spark arrester the combination with the smoke stack having an upper enlargement, increasing and then decreasing in horizontal cross sectional area, when passing upwardly, of an inverted hollow cone suspended within the enlargement, said cone having a series of openings therethrough, tubes passing through the openings and extending beyond, both inwardly and outwardly, the said tubes having part of their outwardly extending portion cut away, as and for the purpose specified.

5. In a spark arrester the combination with the smoke stack having an upper enlargement, increasing and then decreasing in horizontal cross sectional area, when passing upwardly, of an inverted hollow cone suspended within the enlargement, said cone having a series of openings therethrough, straight tubes passing through the openings and extending beyond, both inwardly and outwardly, the lower half of the outwardly extending portion of the tubes being cut away, as and f or the purpose specified.

G. In a spark arrester the combination with the smoke stack having an upper enlargement, increasing and then decreasing in horizontal cross sectional area, when passing upwardly, of an inverted hollow cone suspended within the enlargement said cone having a series of openings therethrough straight tubes passing through the openings and extending beyond, both inwardly and outwardly, the lower half of the outwardly extending portion of the tubes being cut away, the said openings being arranged in the cone, so that the outwardly extending portions of the tubes are staggered the one to the other to prevent sparks from passing across the face of the cone, as specified.

7. In a spark arrester the combination with the stack having an inverted hollow cone supported therein, the said cone having openings therethrough, of means wit-hin the cone and opposing the openingswhereby the sparks passing through the openings are deflected said means being adjustable in relation to the cone, as and for the purpose specified.

8. In a spark arrester the combination with the smoke stack having an inverted hollow cone supported therein, the said cone having openings therethrough, of a second inverted conc supported within the first cone said second cone being adjustable in relation to the first cone, as and for the purpose specified.

9. In a spark arrester the combination with the smoke stack having an inverted hollow cone therein, said cone having tubes passing therethrough, of asecond inverted vertically adjustable cone within the former cone, the said cone being of such dimensions that it opposes all of said tubes, as and for the purpose specified.

10. In a spark arrester the combination with the smoke stack having an upper enlargement, and an inverted hollow cone supported therein, said cone having means to direct the sparks passing up the stack to the inner surface of the cone, of a second cone adjustable on a vertical threaded shaft carried by the fori'ner cone, the latter cone being adapted to deflect the sparks passing through the first cone, as and for the purpose specied.

11. In a spark arrester the combination with the smoke stack having an inverted hollow cone supported therein, said cone having openings therethrough and means for directing the upgoing sparks to the inner surface of the cone, of a threaded shaft extending vertically upwards from the apex of the cone, a second inverted cone operating on the shaft and a lock nut on the shaft, as and for the purpose specified.

12. A spark arrester for smoke stacks, comprising an inverted hollow cone within the stack having means whereby the direction of the sparks is primarily changed by passing Signed at Winnipeg this 31st day of Authem to the inner surfaze of the cone, and a gust 1907.

second cone for secon arly defleotino' the sparks Which have passed through theD first ALFRED HALL' cone said second cone being adjustable in re- Witnesses:

lation to the rst, as and for the purpose M. A. SOMERVILLE, speoed. GERALD S. ROXBURGH. 

